倒数计时
为什么他是直接显示1 而不是 从20开始慢慢倒数？<html>
<body>
<h1 id="Title">Order done</h1>
<script>
var count=20;
while(count!=0){
setTimeout( document.getElementById("Title").innerHTML ="Your order is comming in "+count+" second",1000);
count--;
}
</script>
</body>
</html>
